It's Martian Hunting Season!
I don't post music, as a rule, but this one's exceptional. Do not, I REPEAT, do not have a mouth full of coffee when you play this. You will probably need a new keyboard.
I'd recommend downloading it to your computer's hard drive, and listening to it from there, rather than playing it back online, as you will probably want to listen to it more than once!
Hat tip to UfoPhil!